Electrical measuring instrument.



- (Umani) sTATEsrATEN'r onirica.I

FRAN"K HOLDEN, OF LONDON, ENGLAND, vASSIGvIblRi'TO GENERAL ELEC'IRIC CCYDIPAN'Y',`

A CORPORATION OF NEW YORK.

. ELECTRICAL MEASURING INSTRUMENT..

Specification of Letters Patent.

atented June 27, 1916.

Application filed October 11,1913. Serial No. 794,730.

To all flu/wm t may concern: A

Be it known that I, FRANK HOLDEN, a citizen of the United States, residing at London, England, have invented certain new and useful Improvements in Electrical h/easuringl Instruments, cf which the fola considerable variation in the constant of the meter owing mainly to the change of resistance of the disk or cup.

The object of this invention is to provide means for compensating for these changes of temperature and so prevent the con-y stant of the meter from Varying, and to this end it consists in providing mechanism sensitive to changes in temperature, for transmitting the movement of the rotating element to the registering train.

The features of my invention which I consider patentably novel are definitely indicated in the claims appended hereto.

'lhe details of construction and mode of operation of an electrical measuring instrument embodying the features of myinvention will be understood from the following description taken in connection with the accompanying drawings, wherein two means for carrying my invention 'into effect are illustrated, and in which;

Figures 1 and 2 are end and side elevations respectively of\a device adapted for use in an electric meter and embodying theA features of my invention; and; Figs. 3 and 4L. are similar views of a modified construction.

In carrying my invention into effect according to the modification illustrated in Figs. 1 and 2, I provide a disk ,5 driven either directly or through gearing by the movable or rotatable element of the instrument or meter, A second disk 6 is provided' f which is connected by gearing with the registering train. These two disks are so arranged thattheir axes are parallel to each other but are out of alinement and their faces are arranged 'so as to lie in parallel planes a short distance apart. In the space the register train of the meter.

between the faces of these two disks I arrange a friction wheel 7 adapted to transmit I motion from the disk 5 connected with the meter shaft or spindle to .the disk 6 connected with the registering train. This 'friction wheel`7 is carried by a bi-metallic 0r thermostatic strip 8 which may be rigidly fixed at its outer end to the pin 9 and provided with an adjustable stop -10 so that the Vnormal position of the friction wheel can be adjusted by hand.

In operation, the friction wheel 7 moves y radially' with changes of temperature due to the bi-metallic strip 8 bending in one direcf tion or the other. Owing to the disalinement of the axes of the disks 5 and 6 the ratio of the speeds of the driving and driven shafts will be varied.

According to the modification illustrated in Figs. 3 and 4, instead of employing a pair of friction disks with parallel faces and a transmitting wheel carried by the bi-metallic strip engaging'the surfaces of both, I employ a single disk 11 and a friction wheel 12 engaging its face The disk .11 is designed to be driven by the rotatable meter shaft. .The friction wheel is slidably mounted on a spindle 13 and is adapted to drive the shaft 15 by means of worm gearing 16. The shaft 15 is designed to be operatively connectedto The wheel 12 is provided with a hub voljsleeve to which the bi-metallic strip 14 is connected so that,

as the strip bends, owing to changes in tem-v ment to the registering train through tem-` perature sensitive mechanism, than those described above, will be obvious to those skilled in the art.- Accordingly, I do not desire to limit myself to the particular construction and arrangements of parts here shown, but

soy

aim in the appended claims to .cover all mbdificatiens'iwhich are within .the

my invention;

What I claim as new and desire to selcure -by Letters Patentv of the United States 1. In an electric meter having a rotatable elementoand a driven element, mechanism scope of 195 Y trolling the for compensating for changes in speed of said rotatable element due to temperature variations, said mechanism comprising means operatively connecting the rotatable element to the driven element, and means sensitive to temperature changes operatively related to said last mentioned'means forcenratio of the rates of rotation of the rotatable element and the driven element.

2. In an electrical measuring instrument having a' movable member and a driven member, mechanism for compensating for changes in speed of 'said movable member due to temperature variations comprising means operatively connecting said two members, and temperature responsive means opn eratively related to the means connecting said two members and adapted to vary the ratio of the rates of movement of the two members.

3. ln an electrical .measuring instrument havingv a'movable member and a registering train, means for maintaining the constant77 of the instrument approximately independent of temperature variations comprising mechanism between and 'the registering train of the instrument which is sensitive to temperature changes and which varies the ratio of the rates of movement of the driving and driven menibers.

fi. ln an electrical measuring instrument having the movable member registering train, and atemperature sensitive support for said friction Wheel adapted to vary its point of contact with said disk in accordance with changes of temperature. v 5. In an electrical measuring instrument a movable member and a registering train, a' pair of friction disks mounted on axes which are parallel but out of alinement with eachother, one of said disks being 'adapted for connection to the movable member of the instrumentgwhile the other disk is adapted ing train of the instrument, a friction wheel engaging both of said disks so as to transmit motion from one disk to the other disk,

for connection to the register and a loi-metallic support -for the friction Wheel adapted to vary the points of contact betweenthe disks and the Wheel in accordance with variations in temperature.

In witness whereof, have hereunto set my hand this 1st day of October, 1913.

FRANK HOLDEN.

'Witnesses z CHARLES H. Bulzcnss, Fnnnk. S1-lorries. 

